March 9, 2010

PH1154-PHYSICS II Question Papers


BE/B.TECH DEGREE EXAMINATION,NOVEMBER/DECEMBER 2005
Second semester Electronics and Communication Engineering
PH1154-PHYSICS II Question Papers (Regulations 2004)

Time: 3Hrs Maximum:100 marks
Answer ALL questions.

PART A-(10X2=20 marks)
1.Discuss the motion of electron in perpendicular electric and magnetic fields.
2.What are bound and free electrons?
3.The electrical conductivity of germanium at 20°Cel is 2 mho m?1 .What is its conductivity at 40°C? Band gap of germanium=0.72eV.The charge of an electron =1.6X10?19 C and Boltzmann constant=1.38X10?23JK?1.
4.Explain two applications of super conductors.
5.What are direct and indirect band gap semiconductors? Mention their applications.
6.Define dielectric loss. Explain its origin in dielectrics.
7.The saturation value of magentization fo iron is 1.76X10^6Am?1.Iron has body centred cubic structure with an elementary cube edge of 2.86A°.Every unit cell has two atoms.Calculate the average number of Bohr magnetons contributed to the magnetisation per atom.
8.Distinguish between para and ferro magetism.
9.Give the principle and applications of liquid phase epitaxy.
10.Mention the behaviours of metal-semconductor contracts.How do you differentiate them base work functions of metal and semiconductors?

PART B-(5x16=80 marks)
11.(i)Discuss the bulk crystal growth by horizntal bidgeman technique. (8)
(ii)Give an account on the thin film resistors,diffused resistors and thick film resistos.(8)
12.(a)(i)Using classical free electron theory of metals,derive an expression for electrical conductivity.(10)
(ii)Calculate the mobility and relaxation time of the electrons in silver.Also calculate the electon drift velocity if the field intensity in the material is 1Volt/cm.The resistivity fo silver =1.54X10?8 ohm-m.The free electon density=5.8X10^28/m³.(6)
Or
(b)(i)What are density of states?Using one dimensional potential well and assuming the density of states as (4pkT/h³)exp[(Ef-(px²/2m))/kT]dpx. Derive the Richardson-Dushman equation.(10)
(ii)Discuss the choice of materials for the practical application of thermionic emission at different temperatures and voltages.(6)
13.(a)(i)Discuss the variation of charge density in the case of n-type semiconductor with respect to doping concentration and temperature.(8)
(ii)Deduce the continuity equation and explain it with respect to semiconductors.(8)
Or
(b)(i)Discuss the Meissner effect and isotope effect in super conductors.(8)
(ii)What are type I and type II super conductors?Explain them with suitable examples.(8)
14.(a)(i)Discuss the different types of dilectric breakdown and their characteristics.(12)
(ii)Discuss the frequency and temperature dependence of electronic polarisation.(4)
Or
(b)(i)Describe the construction and working of twisted nematic liquid crystal display.(12)
(ii)Distinguish between fluorescence and phosphorescence.(4)
15.(a)(i)Explain the domain theory of ferromagnetism.(12)
(ii)Using the concept of domains,explain the formation of hysteresis in ferro magnetic properties.(4)
Or
(b)(i)What are hard and soft magnetic materials?Explaintheir magnetic properties.(8)
(ii)Discuss the use of ferrites for making magnetic tapes and bubble memories.(8).


FEEL USEFUL PLEASE GIVE +1

0 comments :

Post a Comment

Get Syllabus in your Mail

Labels

Accenture Admission Notice - 2010 Admission Notification Anna University Anna University Chennai Anna University Question Papers Anna University Trichy Apparel Technology and Management Aptitude Questions Arts and Science Colleges Biomedical Engineering C and CPP Ebooks Calicut University CBSE Question papers Civil Engineering Civil Service Exams Colleges in India Colleges Result Computer Science Engineering Core Jobs CS R2008 CSE CSIR NET EBooks Download ECE EEE EIE Electives Electrical and Electronics Engineering Electronics and communication Electronics and Instrumentation Engineering Engineering Engineering Colleges in Maharashtra Engineering Colleges in TamilNadu Engineering Admissions Engineering Colleges Engineering Colleges in Karnataka Engineering Jobs Engineering Syllabus Entrance Exam Dates Entrance Exam Results Entrance Examination Exam Time Table Experiencer First Year Syllabus Freshers Full Time Jobs Government jobs in india Hardware and Networking Jobs Hotel Management and Catering Technology IGNOU Information Technology INTEVIEW QUESTIONS IT Jobs JNTU Question Papers Jobs in Bangalore Jobs in Chennai Jobs in Coimbatore Jobs in Delhi Jobs in Hyderabad Jobs in India Jobs in Kerala Jobs in Noida Jobs in Tamilnadu Jobs in TATA Karnataka Educations Lab Manuals Mechanical Engineering Medical Colleges Placement Papers Plus 2 Preparation for exams Private Jobs in India Question Papers Question Papers Download Results Announcement Semester 1 Semester 2 Semester 3 Semester 4 Semester 5 Semester 6 Semester 7 Semester 8 Syllabus Syllabus Download Tamil Movie TCS Placement Papers Teaching Jobs TECH MAHINDRA Textile Technology Top colleges University Results UPSC VICEVESVARAYA TECHNOLOGICAL UNIVERSITY waec Walk-in Interview Web Designers

Followers

Archive

 

Privacy Policy
http://topengineeringcollegesintamilnadu.blogspot.com use third-party advertising companies to serve ads when you visit our website. These companies may use information (not including your name, address, email address, or telephone number) about your visits to this and other websites in order to provide advertisements about goods and services of interest to you. If you would like more information about this practice and to know your choices about not having this information used by these companies, click here.